Ballistic coefficient and velocity of Russian Steel case .223 62gr FMJ?

[MtnBiker6510]

Can anyone out there tell me what the muzzle velocity and ballistic coefficient is for Russian steel cased .223, 62gr or 55gr FMJ out of a 16" barrel?

 

[yotewacker]

Not sure if I can find it for military ammo. But, it will be different for each bullet weight and style. Barrel length has nothing to do with it for what you are asking. I can tell you that a .223 in 55gr FMJ is BC of .243

 

[MtnBiker6510]

Not sure if I can find it for military ammo. But, it will be different for each bullet weight and style. Barrel length has nothing to do with it for what you are asking. I can tell you that a .223 in 55gr FMJ is BC of .243

barrel length affects muzzle velocity. Would the 62gr be a much different coefficient of drag?

 

[yotewacker]

Yes, It would matter greatly at far distances. The BC is the ability to deflect wind resistance, sectional density, and bullet length. On the 62gr. the BC is .283. But without knowing the manufacturer of the bullet, it's hard to say for sure. Some 55gr. is .209

the velocity would be very hard to determine without testing one. Nobody really prints this info because so many different manufacturers of the same thing using different powders and bullets.

 

[MtnBiker6510]

Thanks yotewacker, you've already been a great help with the drag coefficient info. I had nowhere to start.

 

[sloughfoot]

I have a chronograph. We could shoot the load and find out the velocity out of your rifle. I don't have any idea about the BC for that bullet but the other poster is probably pretty close.

PM me if interested. We can shoot at 100, 200, and 300 yards. You can measure the drop and a ballistics program can compute the BC. I think.

 

[Yeah]

JBM's web site will calculate BC from near and far velocities or a couple of other statistics.

JBM - Calculations

Zdziarski's Ballistic lists Wolf's 62 grain load as having a 0.291 G1 BC. Their 55 grain as 0.249 G1. I don't know which library he uses for his data and I've not shot those to verify, but his other stuff has been accurate. Shape is the driver here rather than weight. For comparison a 69 grain 0.224" Scenar has a G1 BC around 0.352 and a 75 AMax is 0.435.